Add namespace selector changes to conformance tests

[anthonyrtong]

Test that traffic is denied when namespace labels are updated and to longer match the matchLabels field in cluster network policy. This commit fixes #110

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[k8s-ci-robot]

Hi @anthonyrtong. Thanks for your PR.

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[npinaeva]

/ok-to-test

[npinaeva]

@anthonyrtong thank you for the tests! I am sorry it took me so long to review this. The changes are going in the right direction, but we need to find the right place for them

[npinaeva]

looks good! thank you @anthonyrtong!
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anthonyrtong, npinaeva

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